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Something like that; I'm not entirely sure about the year/level system in Japanese schools, but I believe that first year high school is age 15, so Touma, being that, would be 15 by that system, Mikoto 13, Kuroko 12, and so on. (then again, these ages sound a bit low.... )

Well we know that Touma is a 1st-year high schooler, Mikoto is 2nd year middle, and Kuroko being one grade lower than Mikoto is 1st year. So whatever ages go with those Japanese grades is how old the characters are.

Just the thought of any twelve year old wearing the things that Kuroko wears is... unpleasant. Then again, kids are trying a little too hard to "grow up" these days, so maybe the representation for that age isn't so far off after all.

Something like that; I'm not entirely sure about the year/level system in Japanese schools, but I believe that first year high school is age 15, so Touma, being that, would be 15 by that system, Mikoto 13, Kuroko 12, and so on. (then again, these ages sound a bit low.... )

They might be a year older if their birthday dates fell appropriately. Indeed since the school year starts in April and the Pyrokinetic at the Bank was July 16th, I'd expect some of them to have had a birthday this year.

Somehow it makes me feel better to think everyone except Touma has had thier birthday this school year and that his is on the last day before the cut off for the next year. [Making him the youngest in his year, so unfortunate.]

They might be a year older if their birthday dates fell appropriately. Indeed since the school year starts in April and the Pyrokinetic at the Bank was July 16th, I'd expect some of them to have had a birthday this year.

I know what you mean, but I thought that worked the other way around; i.e. you'd be in the grade of the age that you turn to this year. For example here in the states you'd be in 7th grade even if your 13th birthday was halfway through the school year. (as it was for me) So in Japan, that would mean that Mikoto for example would be in middle year 2 even if she only turned 13 partway through the school term.

Hey, I wouldn't mind if they were older than I thought too, but it doesn't look to be that way, lol. If I'm wrong that's fine though. But it would still mean Kuroko is only 13.........

Meh, she doesn't look that young (except, maybe by her chest size ), so I guess it's all good.

I always thought that Toma was 17, Mikoto 15 and Kuroko 14 since i think i remember reading it somewhere.

Well, don't forget that quite some time pass during Index, so of course they all age as time flow.
IIRC the events of Railgun are set before the Index arc.
Anyone with a better knowledge of the timeline to confirm?

Well, don't forget that quite some time pass during Index, so of course they all age as time flow.
IIRC the events of Railgun are set before the Index arc.
Anyone with a better knowledge of the timeline to confirm?

Spoiler for Manga/Novel timeline:

The bankrobbery with the Pyrokinetic was 16 July. Mikoto and Uiharu meet for the first time.